Method for forming molded article by press molding
US10960633B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 18, 2016 |
| Grant date | Mar 30, 2021 |
| Priority date | — |
| Expiry date | Sep 15, 2036 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22F2003/026
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Method of forming a compact based on the press forming method provides a compact having high density and not having cracking or surface roughness in a product and without compact adhesion to press forming mold wall occurring, including steps: filling raw material powder in a cavity formed by an outer mold and lower punch, or outer mold and lower punch and core rod, pressing and forming raw material powder between an outer punch and lower punch, and extracting the compact obtained out of the outer mold by the lower punch, wherein a lubricating film of a press forming mold lubricant containing oil as main component is formed on at least part of outer mold inner surface, or outer mold inner surface and core rod outer circumferential surface before filling the raw material powder in the cavity, and press forming so that compact density ratio is not less than 93%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.